rails--rails/activerecord/CHANGELOG.md

• Rails 6 requires Ruby 2.4.1 or newer.

  Jeremy Daer

• Deprecate update_attributes/! in favor of update/!.

  Eddie Lebow

• Add ActiveRecord::Base.create_or_find_by/! to deal with the SELECT/INSERT race condition in ActiveRecord::Base.find_or_create_by/! by leaning on unique constraints in the database.

  DHH

• Add Relation#pick as short-hand for single-value plucks.

  DHH

Please check 5-2-stable for previous changes.